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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6c0e0d8fd78d393a254bfbfb507d51e3013273a73e0a92b0ab340c2764866e' 
  AND token = 'iBLEG8y8XMuwaoh83T15TbpEOT2OyZlgKtO211PUQ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}